CN212875036U - High-energy annular bi-pass laser amplifier - Google Patents
High-energy annular bi-pass laser amplifier Download PDFInfo
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- CN212875036U CN212875036U CN202022119248.3U CN202022119248U CN212875036U CN 212875036 U CN212875036 U CN 212875036U CN 202022119248 U CN202022119248 U CN 202022119248U CN 212875036 U CN212875036 U CN 212875036U
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Abstract
The utility model discloses a high energy annular bi-pass laser amplifier relates to the laser technology field, and this high energy annular bi-pass laser amplifier is including oscillator output portion and the annular bi-pass amplifier that sets gradually, the collimated light of expanding the beam is exported to the oscillator output portion, annular bi-pass amplifier is right expand the collimated light and carry out efficiency amplification. The utility model discloses place the bi-pass light path of crystal bar amplifier in an annular light path and make the amplification light pass through the amplifier along the direction the same with the oscillator input light twice, to most only set up an isolator between oscillator and the amplifier, both saved the cost, the efficiency of amplifier has been improved again, compare and come and go twice bi-pass light path amplifier, annular bi-pass amplifier has lacked an isolator, amplification efficiency and laser energy have improved more than 20%, compare simultaneously and also be difficult to form the resonant cavity in prior art and damage the device.
Description
Technical Field
The utility model relates to the field of laser technology, especially, relate to a high energy annular bi-pass laser amplifier.
Background
A conventional solution to achieve high energy in short pulse lasers is a MOPA (master oscillator power amplifier) structure using various amplification techniques and materials. High energy, low repetition frequency amplifiers are typically fabricated using large diameter Nd: YAG or Nd: YLF, Nd: GLASS laser crystal rod materials. The amplifier laser crystal rods are typically 10-45mm in diameter and 100 to 200mm in length. The low repetition frequency amplifier usually adopts side pumping of flash lamps, and 1-8 flash lamps are arranged around the side of a laser crystal rod in the same cavity, so that the laser crystal rod can absorb energy of the flash lamps to generate and amplify laser light 1J-100J.
In the process of implementing the present invention, the inventor finds that there are at least the following problems in the prior art: the common laser amplifier is a single-pass optical path or a double-pass optical path which makes two round trips to increase energy. The high-energy amplification light spot is large, and the depolarization effect is obvious; because the amplified light returns along the original path to change the polarization state and then is output in the double-pass light path which returns twice, 1 or even 2 optical isolators are required to be added between the oscillator and the amplifier; the cost is greatly improved by the plurality of optical isolators, the energy input to the amplifier by the oscillator is greatly reduced, and the efficiency of the amplifier is reduced; the total reflection mirror to and from the optical path also tends to form a resonant cavity with the oscillator and thus damage the device.
SUMMERY OF THE UTILITY MODEL
In order to overcome the deficiency of the related products in the prior art, the utility model provides a high energy annular bi-pass laser amplifier.
The utility model provides a high energy annular bi-pass laser amplifier, include: the device comprises an oscillator output part and an annular bi-pass amplifier which are sequentially arranged, wherein the oscillator output part outputs beam expanding collimated light, and the annular bi-pass amplifier amplifies the efficiency of the beam expanding collimated light;
the oscillator output part comprises a pulse laser oscillator, an optical axis converter, an optical isolator, a concave lens and a convex lens which are coaxially arranged in sequence, the pulse laser oscillator outputs p-polarized collimated light with lower energy, the optical axis of the p-polarized collimated light after passing through the optical axis converter is coaxial with the optical axis of the annular double-pass amplifier, the p-polarized collimated light is expanded by a beam expanding system consisting of the optical isolator, the concave lens and the convex lens in sequence, and the p-polarized collimated light after expanding is output to the annular double-pass amplifier;
the annular double-pass amplifier comprises a first polarization beam combiner, a laser crystal bar amplification cavity, a second polarization beam combiner, a first reflector, a second reflector, a quartz plate, a half-wave plate, a third reflector and a third polarization beam combiner, the optical axis direction of the beam expanding collimated light output by the oscillator output part is taken as the horizontal positive direction, the first polarization beam combiner, the laser crystal bar amplifying cavity, the second polarization beam combiner and the first reflector are coaxially arranged in sequence along the horizontal positive direction, the second reflector is arranged right below the first reflector, the second reflector, the quartz plate, the half-wave plate and the third reflector are coaxially arranged in sequence along the horizontal negative direction, and the third reflector is arranged right below the first polarization beam combiner, and the third polarization beam combiner is arranged right below the second polarization beam combiner in parallel.
The utility model discloses an in some embodiments, first polarization beam combiner sets up to follow horizontal positive direction clockwise 45, first speculum sets up to follow horizontal positive direction anticlockwise rotates 45, the second speculum sets up to follow horizontal negative direction clockwise 45, the third speculum sets up to follow horizontal positive direction anticlockwise rotates 45, second polarization beam combiner sets up to follow an acute angle of horizontal positive direction anticlockwise rotation.
In some embodiments of the present invention, the expanded collimated light output by the oscillator output part is 1064nm light or 1053nm light.
In some embodiments of the present invention, the pump light portion of the laser crystal rod amplifying cavity is one of a flash lamp and a laser diode.
In some embodiments of the present invention, the laser crystal rod portion of the laser crystal rod amplification chamber is one of Nd: YAG or Nd: YLF, Nd: GLASS.
In some embodiments of the present invention, the first polarization beam combiner and the second polarization beam combiner are one of a polarization beam splitter and a polarization beam splitter prism.
In some embodiments of the present invention, the optical axis changer is one of a climbing mirror and a folding mirror or a combination of both.
Compared with the prior art, the utility model discloses there is following advantage:
the utility model discloses a high energy annular bi-pass laser amplifier places the bi-pass light path of crystal bar amplifier in an annular light path and makes the amplified light pass through the amplifier along the same direction with the oscillator input light twice, at most only set up an isolator between oscillator and the amplifier, both the cost is saved, the efficiency of amplifier has been improved again, the oscillator amplifies for the p polarization in the crystal bar amplifier with p polarized light for the first time, become s polarized light after quartz plate compensation depolarization effect and the half-wave plate in the annular light path, amplify for the s polarization amplified light in the crystal bar amplifier for the second time after rethread polarization beam combiner, and output the amplified light through the polaroid; compared with a double-pass optical path amplifier which returns twice, the annular double-pass amplifier has one less isolator, the amplification efficiency and the laser energy are improved by more than 20%, and meanwhile, compared with the prior art, a resonant cavity damage device is not easy to form.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is the structure schematic diagram of a high-energy annular bi-pass laser amplifier.
Description of reference numerals:
the laser comprises a 1-oscillator output part, a 2-annular double-pass amplifier, an 11-pulse laser oscillator, a 12-optical axis converter, a 13-optical isolator, a 14-concave lens, a 15-convex lens, a 21-first polarization beam combiner, a 22-laser crystal bar amplification cavity, a 23-second polarization beam combiner, a 24-first reflector, a 25-second reflector, a 26-quartz plate, a 27-half-wave plate, a 28-third reflector and a 29-third polarization beam combiner.
Detailed Description
In order to make the technical field person understand the scheme of the present invention better, the following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical scheme in the embodiments of the present invention. It is to be understood that the embodiments described are merely exemplary of the invention, and that no limitations are intended to the details of construction or design herein shown. The present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for the purpose of providing a more thorough understanding of the present disclosure.
Referring to fig. 1, high energy annular bi-pass laser amplifier is including oscillator output 1 and the annular bi-pass amplifier 2 that set gradually, the collimated light is expanded in the output of oscillator output 1, annular bi-pass amplifier 2 is right the collimated light that expands carries out efficiency and enlargies.
The oscillator output part 1 comprises a pulse laser oscillator 11, an optical axis converter 12, an optical isolator 13, a concave lens 14 and a convex lens 15 which are coaxially arranged in sequence, the pulse laser oscillator 11 outputs p-polarized collimated light with lower energy, the optical axis of the p-polarized collimated light passes through the optical axis converter 12 and is coaxial with the optical axis of the annular double-pass amplifier 2, the p-polarized collimated light sequentially passes through a beam expanding system consisting of the optical isolator 13, the concave lens 14 and the convex lens 15 to be expanded, and the p-polarized expanded collimated light is output to the position A of the annular double-pass amplifier 2.
The annular double-pass amplifier 2 comprises a first polarization beam combiner 21, a laser crystal bar amplification cavity 22, a second polarization beam combiner 23, a first reflector 24, a second reflector 25, a quartz plate 26, a half-wave plate 27, a third reflector 28 and a third polarization beam combiner 29, if the optical axis direction of the beam-expanded collimated light output by the oscillator output part 1 is the horizontal positive direction, the first polarization beam combiner 21, the laser crystal rod amplifying cavity 22, the second polarization beam combiner 23 and the first reflector 24 are coaxially arranged in sequence along the positive horizontal direction, the second reflector 25 is arranged right below the first reflector 24, the second reflector 25, the quartz plate 26, the half-wave plate 27 and the third reflector 28 are coaxially arranged in sequence along the horizontal negative direction, the third reflector 28 is disposed right below the first polarization beam combiner 21, and the third polarization beam combiner 29 is disposed in parallel right below the second polarization beam combiner 23; the p-polarized beam expanding collimated light at the position A is transmitted after passing through the first polarization beam combiner 21, passes through the laser crystal bar amplification cavity 22, absorbs the energy of pump light at the side of a flash lamp or a laser diode when passing through the laser crystal bar in the laser crystal bar amplification cavity 22, then amplifies the energy, the amplified p-polarized light is transmitted after passing through the second polarization beam combiner 23, is reflected to the position B through the first reflector 24 to be single-pass amplified light, is reflected after passing through the second reflector 25, is subjected to polarization compensation after passing through the quartz plate 26, is s-polarized after passing through the half-wave plate 27, is reflected after passing through the third reflector 28, is reflected after passing through the first polarization beam combiner 21, is amplified again after passing through the laser crystal bar amplification cavity 22 to be energy, and the bi-pass amplified light s-polarized light is reflected after passing through the second polarization beam combiner 23 and is reflected after passing through the third polarization beam combiner 29 to C to output bi-pass amplified laser.
Specifically in this embodiment, the first polarization beam combiner 21 is configured to rotate clockwise 45 ° in the horizontal positive direction, the first reflecting mirror 24 is configured to rotate counterclockwise 45 ° in the horizontal positive direction, the second reflecting mirror 25 is configured to rotate clockwise 45 ° in the horizontal negative direction, the third reflecting mirror 28 is configured to rotate counterclockwise 45 ° in the horizontal positive direction, and the second polarization beam combiner 23 is configured to rotate counterclockwise one acute angle in the horizontal positive direction.
The expanded beam collimated light output by the oscillator output part 1 includes, but is not limited to, 1064nm light or 1053nm light.
The pumping part of the laser crystal rod amplification cavity 22 includes but is not limited to one of a flash lamp and a laser diode.
The laser crystal rod portion of the laser crystal rod amplification cavity 22 includes, but is not limited to, one of Nd: YAG or Nd: YLF, Nd: GLASS.
The first polarization beam combiner 21 and the second polarization beam combiner 23 are one of polarization beam splitters and polarization beam splitting prisms, but not limited thereto.
The optical axis changer 12 includes, but is not limited to, one of a climbing mirror, a folding mirror, or a combination of both.
Of course, it should be noted that, in some aspects of the present invention, the polarization beam combiner may be replaced with a polarization beam splitter PBS; the reflector can be replaced by a right-angle prism; the optical isolator 13 may be eliminated when the output of the annular double pass amplifier 2 is within 3J.
The utility model discloses a high energy annular bi-pass laser amplifier places the bi-pass light path of crystal bar amplifier in an annular light path and makes the amplified light pass through the amplifier along the same direction with the oscillator input light twice, at most only set up an isolator between oscillator and the amplifier, both the cost is saved, the efficiency of amplifier has been improved again, the oscillator amplifies for the p polarization amplified light in the crystal bar amplifier with p polarized light for the first time, become s polarized light after quartz plate 26 compensation depolarization effect and half-wave plate 27 in the annular light path, amplify for the s polarization amplified light in the crystal bar amplifier for the second time after rethread polarization beam combiner, and output bi-pass amplified light through the polaroid; compared with a double-pass optical path amplifier which returns twice, the annular double-pass amplifier has one less isolator, the amplification efficiency and the laser energy are improved by more than 20%, and meanwhile, compared with the prior art, a resonant cavity damage device is not easy to form.
Those not described in detail in this specification are within the skill of the art. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing detailed description, or equivalent replacements may be made for some of the technical features of the embodiments. All utilize the equivalent structure that the content of the utility model discloses a specification and attached drawing was done, direct or indirect application is in other relevant technical field, all is in the same way the utility model discloses within the patent protection scope.
Claims (7)
1. A high energy annular bi-pass laser amplifier, comprising: the device comprises an oscillator output part and an annular bi-pass amplifier which are sequentially arranged, wherein the oscillator output part outputs beam expanding collimated light, and the annular bi-pass amplifier amplifies the efficiency of the beam expanding collimated light;
the oscillator output part comprises a pulse laser oscillator, an optical axis converter, an optical isolator, a concave lens and a convex lens which are coaxially arranged in sequence, the pulse laser oscillator outputs p-polarized collimated light with lower energy, the optical axis of the p-polarized collimated light after passing through the optical axis converter is coaxial with the optical axis of the annular double-pass amplifier, the p-polarized collimated light is expanded by a beam expanding system consisting of the optical isolator, the concave lens and the convex lens in sequence, and the p-polarized collimated light after expanding is output to the annular double-pass amplifier;
the annular double-pass amplifier comprises a first polarization beam combiner, a laser crystal bar amplification cavity, a second polarization beam combiner, a first reflector, a second reflector, a quartz plate, a half-wave plate, a third reflector and a third polarization beam combiner, the optical axis direction of the beam expanding collimated light output by the oscillator output part is taken as the horizontal positive direction, the first polarization beam combiner, the laser crystal bar amplifying cavity, the second polarization beam combiner and the first reflector are coaxially arranged in sequence along the horizontal positive direction, the second reflector is arranged right below the first reflector, the second reflector, the quartz plate, the half-wave plate and the third reflector are coaxially arranged in sequence along the horizontal negative direction, and the third reflector is arranged right below the first polarization beam combiner, and the third polarization beam combiner is arranged right below the second polarization beam combiner in parallel.
2. The high-energy annular double-pass laser amplifier according to claim 1, wherein: first polarization beam combiner sets up to follow horizontal positive direction clockwise rotation 45, first speculum sets up to follow horizontal positive direction anticlockwise rotation 45, the second speculum sets up to follow horizontal negative direction clockwise rotation 45, the third speculum sets up to follow horizontal positive direction anticlockwise rotation 45, second polarization beam combiner sets up to follow an acute angle of horizontal positive direction anticlockwise rotation.
3. The high-energy annular double-pass laser amplifier according to claim 1, wherein: the expanded beam collimated light output by the oscillator output part is 1064nm light or 1053nm light.
4. The high-energy annular double-pass laser amplifier according to claim 1, wherein: the pump light part of the laser crystal bar amplifying cavity is one of a flash lamp and a laser diode.
5. The high-energy annular double-pass laser amplifier according to claim 1, wherein: the laser crystal rod part of the laser crystal rod amplifying cavity is one of Nd: YAG or Nd: YLF, Nd: GLASS.
6. The high-energy annular double-pass laser amplifier according to claim 1, wherein: the first polarization beam combiner and the second polarization beam combiner are one of a polarization beam splitter and a polarization beam splitter prism.
7. The high-energy annular double-pass laser amplifier according to claim 1, wherein: the optical axis converter is one of a climbing mirror and a folding reflecting mirror or a combination of the climbing mirror and the folding reflecting mirror.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022119248.3U CN212875036U (en) | 2020-09-24 | 2020-09-24 | High-energy annular bi-pass laser amplifier |
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| CN202022119248.3U CN212875036U (en) | 2020-09-24 | 2020-09-24 | High-energy annular bi-pass laser amplifier |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115548847A (en) * | 2022-11-29 | 2022-12-30 | 武汉光谷航天三江激光产业技术研究院有限公司 | mJ-level high-repetition-frequency all-fiber femtosecond laser and method |
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- 2020-09-24 CN CN202022119248.3U patent/CN212875036U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115548847A (en) * | 2022-11-29 | 2022-12-30 | 武汉光谷航天三江激光产业技术研究院有限公司 | mJ-level high-repetition-frequency all-fiber femtosecond laser and method |
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